强心甙对下列哪一些心衰的治疗疗效较差甚至无效（）

A.窦性节律的轻、中度心衰

B.贫血、甲亢

C.肺源性心脏病、活动性心肌炎

D.严重二尖瓣狭窄和缩窄性心包炎

E.高血压、先天性心脏病

A client who is a gravida 1 para 0 has been admitted to the perinatal admission unit and is in early labor. The client’s cervical examination would reveal which of the following（）

A. 2 cm dilated; 100% effaced at 0 station.

B. 4 to 5 cm dilated; 80% effaced at -1 station.

C. 2 cm dilated; 50% effaced at +1 station.

D. 3 cm dilated; 50% effaced at 0 station.